With the LSM11 wideband sensors becoming quite costly and very outdated compared to the latest Bosch LSU 4.9 sensors, I decided to replace the factory Dyno Dynamics (Autronic) wideband with an ALM-LED that has both analog and serial output (along with a couple of inputs if required).
As such with a bit of digging and tracing the wires, the below information might come in handy for some one else looking to do the same. I simply made up a male DB9 connector to match the existing autronic cable from the dyno. I originally planned to replace the round connector at the dyno controller, but after ordering the wrong “AMP” connector size I went with the DB9 connector instead.
Original Autronic Wideband Connector Wiring:
Cable Colour – DB9 PIN # – Round Connector Pin # – Usage
Green – Pin 1,2 DB9 – Pin 1 – Power Ground
Brown – Pin 4 DB9 – Pin 4 – Sensor Ground
Red – Pin 5 DB9 – Pin 5 – 0-5V from Wideband to Dyno
Yellow – Pin 8 DB9 – Pin 8 – 0-1V output
White – Pin 6/7 DB9 – Pin 6 – 16v Supply from Dyno
Dyno software will either need to modified to suite a 10-20afr range if that’s what your wideband uses by default or you need to program your widebands analog output to the standard 10-30 afr range the Autronic uses.
With the new wideband sensor being able to read much leaner mixtures, the lambda value on the led display is pretty high. But testing on a car proved to be dead on accurate from the digital to analog lambda value.